US 6,172,476 B2 · Two step power output motor and associated HVAC systems and methods

Abstract

An electrical control system for an induction motor for achieving optimum efficiency at both full and partial loads at markedly reduced electrical components costs while maximizing reliability over the range of load, and for achieving a two step motor power output in a greatly simplified manner, the circuit having an electrical induction motor adapted for connection to line electrical power at maximum motor operating frequency, and to a second source of electrical power at approximately one half of the maximum operating frequency, wherein an electrical switch is provided for selectively connecting each power source to the motor, wherein the second source is a reduced frequency wave form generator for producing a reduced frequency wave form.

Claims17

Dependent claims

A method for operating a system for conditioning a space, the system including a compressor with an electrical motor, an expansion valve, a condenser, an air mover with an electrical motor, and an evaporator, said method including the steps of:

sensing the condition of the space to be treated;
operating the compressor at a first preselected and fixed speed when the sensed condition indicates that the system should be operated at a maximum load;
operating the compressor at a second preselected and fixed speed, lower than the first speed, when the sensed condition indicates that the system should be operated at a lesser load;
and
driving the motor of the air mover by line current when the compressor operates at the first preselected speed and by a second source of fixed power at a frequency lower than the frequency of the line current, when the compressor operates at the second preselected speed.

2 more elements

Dependencies are inferred from the claim text.

Two step power output motor and associated HVAC systems and methods

Life of this patent

Two step power output motor and associated HVAC systems and methods

Life of this patent

Abstract

Claims17